Now to the shocking new revelations from former vice president dick cheney, admitting he feared his heart problems could cost him his life, not in the way you linsey davis is here with that. Reporter: He's suffered five heart attacks. Had numerous procedures. At one time he had a defibrillator implanted. He said at one point he feared the thing giving him life could kill him. It was a dramatic plot twit in showtime's hit series "homeland." The vice president's pacemaker remotely hacked by a terrorist, sending a signal to the device to send him into cardiac arrest. I'm killing you. Reporter: And now, a surprising admission from former vice president dick cheney. He feared the same thing in real life. I was aware of the danger, if you will, that existed. I knew from experience we had had and the necessity for adjusting my own device, that it was an accurate portrayal of it. Reporter: In an interview with "60 minutes," cheney says his doctors turned off the wireless function in his own pacemaker in 2007. I worried that someone could kill you. Reporter: He wasn't concerned that the heart problems themselves could kill him. Getting defensive when asked why his doctors would give him a clean bill of health despite his multiple heart attacks. I'm not responsible for that. I don't know what took place between the doctors. But sir, you saw it? I think the bottom line was, I up to the task of being vice president. There's no question based on the fact that I did it for eight years that they were right. Reporter: Nonetheless, he said he did keep a letter of resignation by his side. I, richard cheney -- Reporter: He says instead of fearing death, he's enjoying life. My first words after they said it would work great was hot damn. Reporter: I guess that's what you say after you have surned five heart attacks. He says he has a new lease of life. In his new book, he opens up about his heart and his near brush with death in 2010. Three years later, he's back to hunting and fishing. He can confirm, he does have a heart. We have to wish you a happy

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